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. 2018 Feb 6;4:9. doi: 10.1038/s41420-017-0001-x

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© The Author(s) 2018

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Fig. 4 — Frequency and frequency normalized with abundance of each amino acid found at P1 site are illustrated in (a) and (b), respectively, whereas those for P1′ site are shown in (c) and (d), respectively